Adjust UUID lower-case translation from straight-forward tr(1)

usage to an equivalent csh(1) usage as tr(1) stays in /usr/bin and
/etc/rc.d/hostid has just the root filesystem (and this way mainly the
tools in /bin) available.

I've chosen csh(1) here as the string manipulation tools available in
/bin is extremely limited and the (only) alternative ed(1) usage would
have been a lot more complicated or even might require a temporary file.

etc/rc.d/hostid

@@ -56,7 +56,8 @@ hostid_set()
 
 hostid_hardware()
 {
-	uuid=`kenv smbios.system.uuid 2>/dev/null | tr '[:upper:]' '[:lower:]'`
+	uuid=`kenv smbios.system.uuid 2>/dev/null`
+	uuid=`csh -c 'echo -n ${*:al}' "$uuid"`
 	x="[0-9a-f]"
 	y=$x$x$x$x
 	case "${uuid}" in